CN202886471U - Multi-channel leakage current phase difference detection equipment - Google Patents
Multi-channel leakage current phase difference detection equipment Download PDFInfo
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- CN202886471U CN202886471U CN 201220559604 CN201220559604U CN202886471U CN 202886471 U CN202886471 U CN 202886471U CN 201220559604 CN201220559604 CN 201220559604 CN 201220559604 U CN201220559604 U CN 201220559604U CN 202886471 U CN202886471 U CN 202886471U
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Abstract
The utility model relates to a current phase difference detection device. The multi-channel leakage current phase difference detection equipment comprises a front-end signal conditioning circuit, an analog/digital (A/D) acquisition circuit and a digital signal processor (DSP), wherein a reference signal and the acquired multi-channel leakage current signal are converted into voltage signals through a precision resistor and are input into the front-end signal conditioning circuit; the front-end signal conditioning circuit performs noise reduction and filtering processing on the signals and transmits the signals to the A/D acquisition circuit; the sampling signal output by the A/D acquisition circuit is subjected to fast Fourier transform (FFT), inverse fast Fourier transform (IFFT) and filtering processing by utilizing the digital filtering technology; the sampling signal output by the A/D acquisition circuit is transmitted to a digital filter field programmable gate array (FPGA); the digital filter FPGA transmits the processed data to the DSP; and the phase difference is calculated and output through the DSP. The multi-channel leakage current phase difference detection equipment is simple in structure, high in calculation speed and real-time property, and accurately achieves the purpose that the dielectric loss is monitored on line in real time; and moreover, the safety and stable operation of a power system is promoted.
Description
Technical field
The utility model relates to a kind of current phase device for detecting difference, particularly relates to a kind of hyperchannel Leakage Current phase difference detection equipment.
Background technology
Power capacitor is power back-off equipment important in the electric system, and the stability of power capacitor and reliability directly affect the safety of electric system and stablize.Therefore, usually need the running status of power capacitor is carried out real time on-line monitoring.The important parameter of assessment power capacitor running status is dielectric dissipation factor tan (δ), and this parameter can be monitored the Leakage Current of power capacitor and the phase differential of reference source obtains by current sensor.There are the following problems to Leakage Current phase differential monitoring at present: 1) the phase difference detection precision is low, and traditional phase difference detection equipment adopts simple harmonic analysis method computational accuracy low; 2) the phase differential test result is along with working temperature drift is large, traditional phase difference detection equipment utilization capacitance resistance ware designing filter, and the device parameters value varies with temperature and changes, and causes filter parameter to change, thereby causes phase difference calculating result's deviation; 3) computing time long, real-time is not high.In electric system, the Dielectric loss angle of capacitor is a very little numerical value, generally between 0.001～0.02rad, in the measuring process of reality, because noise and the interference of complexity on the line of electric force is difficult to obtain accurate result of calculation.Therefore, how the dielectric dissipation factor of Measurement accuracy power capacitor is a difficult problem in the electric system.
Summary of the invention
The utility model is not enough for prior art, proposes a kind of fast, accurately current and phase difference checkout equipment, for the dielectric dissipation factor of Measurement accuracy power capacitor is laid a good foundation.
The technical scheme that the utility model adopts:
A kind of hyperchannel Leakage Current phase difference detection equipment, comprise analog signal processing, AD Acquisition Circuit and dsp processor, the multichannel leakage current signal of reference signal and collection is converted to voltage signal through precision resistance and is input to analog signal processing, analog signal processing carries out noise reduction to signal, filtering is sent to the AD Acquisition Circuit after processing, sampled signal to the output of AD Acquisition Circuit utilizes digital filtering technique to carry out FFT, IFFT, filtering is processed, AD Acquisition Circuit output sampled signal sends to digital filter FPGA, data after digital filter FPGA will process are sent to dsp processor, carry out phase difference calculating and output by dsp processor.
Described hyperchannel Leakage Current phase difference detection equipment, analog signal processing is adjusted and simple filtering for signal is gained, adopt three grades of modulate circuits, reference path first order modulate circuit adopts integrated operational amplifier to realize the amplification of fixed gain, the first order path of leakage current adopts the integrated operational amplifier of adjustable gain pattern, adjust the one stage signal Voltage-output in suitable amplitude by multi-path analog switch MAX308ESE, the analog switch path of MAX308ESE is selected control end CS_A10, CS_A11, the controlled connection dsp processor of CS_A12, first order modulate circuit output signal is cascaded to second level modulate circuit, second level modulate circuit is designed to the Sallen-Key low-pass filter, third level modulate circuit sampling totalizer is adjusted to 2.5V with the signal DC level, so that signal satisfies the sample range of AD, and conditioning and the AD of signal are gathered isolation, change the impact on signal to prevent input impedance.
Described hyperchannel Leakage Current phase difference detection equipment, the AD sample circuit adopts AD conversion chip AD8365, dsp processor controlling of sampling chip TMS320F28335, data after digital filter FPGA processes are sent to TMS320F28335, control chip TMS320F28335 regulates the gain coefficient of front end modulate circuit, and utilize timer output on the sheet, and export to AD8365 as sampling clock, start sampling and stop sampling; The startup of FPGA computing, processing stops to control function and is finished by TMS320F28335.
Described hyperchannel Leakage Current phase difference detection equipment, contain the phase difference compensation circuit, adopt temperature sensor to obtain working temperature, the temperature that utilization has been surveyed and the demarcation numerical value of phase differential, phase difference calculating result under the different temperatures is revised, and it is the digital temperature sensor of TMP121 that temperature sensor adopts model, and TMP121 is connected with TMS320F28335 by the spi bus interface, realization is to the collection of working temperature, the poor compensation of the line phase of going forward side by side.
The beneficial effects of the utility model:
1, the multichannel leakage current phase difference detection of the utility model equipment, simple in structure, computing velocity is fast, real-time is high, accurately realized dielectric loss is carried out real time on-line monitoring.The safety and stability that is conducive to electric system.
2, the multichannel leakage current phase difference detection of the utility model equipment, utilize the working temperature of built-in temperature sensor real-time monitoring system, adopt temperature compensation, utilize default calibration value to carry out phase difference compensation, can carry out establishment and compensation to the temperature drift of phase differential, affected by working environment little, be suitable for actual electric power environmental, be widely used.
Description of drawings
Fig. 1: the multichannel leakage current phase difference detection of the utility model device systems forms structural drawing;
Fig. 2: reference channel first order modulate circuit;
Fig. 3: discharge current passage first order modulate circuit;
Fig. 4: second level modulate circuit;
Fig. 5: third level modulate circuit;
Fig. 6: AD8365 circuit diagram;
Fig. 7: digital filter FPGA schematic diagram;
Fig. 8: TMS320F28335 circuit diagram;
Fig. 9: temperature sensor circuit figure.
Embodiment
Embodiment one: referring to Fig. 1, the utility model hyperchannel Leakage Current phase difference detection equipment, comprise analog signal processing, AD Acquisition Circuit and dsp processor, the multichannel leakage current signal of reference signal and collection is converted to voltage signal through precision resistance and is input to analog signal processing, analog signal processing carries out noise reduction to signal, filtering is sent to the AD Acquisition Circuit after processing, sampled signal to the output of AD Acquisition Circuit utilizes digital filtering technique to carry out FFT, IFFT, filtering is processed, AD Acquisition Circuit output sampled signal sends to digital filter FPGA, data after digital filter FPGA will process are sent to dsp processor, carry out phase difference calculating and output by dsp processor.
Embodiment two: referring to Fig. 1, Fig. 9, the hyperchannel Leakage Current phase difference detection equipment of the present embodiment, contain the phase difference compensation circuit, adopt temperature sensor to obtain working temperature, it is the digital temperature sensor of TMP121 that temperature sensor adopts model, TMP121 is connected with dsp processor by the spi bus interface, realizes the collection to working temperature, the poor compensation of the line phase of going forward side by side.
Embodiment three: referring to Fig. 1～Fig. 9, and the hyperchannel Leakage Current phase difference detection equipment of the present embodiment, the AD Acquisition Circuit adopts AD8365, dsp processor to adopt special integrated circuit TMS320F28335.And utilize the working temperature of temperature sensor real-time monitoring system, and and utilize default calibration value to carry out phase difference compensation, dielectric loss is carried out real time on-line monitoring, that this scheme has is simple in structure, computing velocity is fast, is subjected to working environment to affect little advantage.
As shown in Figure 1, reference signal and multichannel leakage current signal are converted to voltage signal through precision resistance and enter into the front end modulate circuit, the front end modulate circuit carries out noise reduction, filtering processing to signal, and send AD8365 to sample, data after the sampling send to FPGA, FPGA utilizes digital filtering technique, carries out the processing such as FFT, IFFT, filtering, and the data after the processing are sent to dsp processor TMS320F28335 and carry out phase difference calculating.TMS320F28335 can regulate the gain coefficient of front end modulate circuit; TMS230F28335 utilizes timer output on the sheet, exports to AD8365 as sampling clock, and starts sampling and stop sampling; FPGA computing and processing are finished by TMS320F28335.Temperature sensor is used for obtaining working temperature, the poor compensation of the line phase of going forward side by side.
Fig. 2～Fig. 5 is analog signal processing.Reference signal and leakage current are converted to voltage signal by precision resistance with current signal and are input in the front end modulate circuit.
Analog signal processing is adjusted and simple filtering for signal is gained, and adopts three grades of modulate circuits, and is as follows respectively, the amplification of reference path first order modulate circuit realization fixed gain, and the gain computing formula is Av=R5/R4; The first order path of leakage current adopts the adjustable gain pattern, adjust the one stage signal Voltage-output in suitable amplitude, MAX308ESE is the multi-path analog switch, CS_A10, CS_A11, CS_A12 are that the analog switch path is selected control end, CS_A10, CS_A11, CS_A12 are controlled by TMS320F28335, adopt the IO pattern to realize, this circuit is realized 8 kinds of variable gains, is respectively 1,1.2,2,3.8,6.8,14,25.6,48.8; Signal through after the first order conditioning is cascaded to second level modulate circuit, and second level modulate circuit is designed to the Sallen-Key low-pass filter structure, and the Sallen-Key wave filter has realizes simply gain and the adjustable characteristics of cutoff frequency.Signal can suppress the power frequency component out-of-band noise through Sallen-Key, and the computing formula of this wave filter is:
K?=?1+R17/R16；
Q?=?（R15×R18×C7×C8）
1/2?/[R15×C7+?R18×C7+?R18×C8（1-K）]；
Fc?=?1/[2×π（R15×R18×C7×C8）
1/2]；
Third level modulate circuit is realized the function of totalizer as shown in Figure 5, and the signal DC level is adjusted to 2.5V, by third level modulate circuit, so that signal satisfies the sample range of AD, and the conditioning of signal and AD gathered isolation, prevent that input impedance from changing the impact on signal.
Fig. 6 is the AD sample circuit.U23 is AD conversion chip AD8365 among the figure, Y23 is active crystal oscillator, and the clock greater than 16 times of sample frequency can be provided, and [DATA15:DATA0] is AD chip data bus, [ADDR2:ADDR0] is AD chip address bus, NRD is read signal, and NCS is chip selection signal, and NADRST is reset signal, ADINT is the signal after AD converts, ADCLK is the quick sampling clock, and its speed will be higher than more than 16 times of sampling clock, and ADHOLD is sampling clock.Reset signal (NADRST) and the sampled clock signal (ADHOLD) of TMS320F28335 control AD8365, address bus ([ADDR2:ADDR0]), reading signal lines (NRD), chip selection signal (NCS) has FPGA control, ADINT is the synchronizing signal with FPGA, be used for notice FPGA sampling and finish, FPGA obtains sampled data by control address signal, chip selection signal and read signal;
Fig. 7 is digital filter FPGA circuit.FPGA plays the function of accelerating computing, under complete software design conditions, realizes that the computings such as FFT, IFFT, convolution need to take a large amount of CPU time, and real-time is poor, therefore utilizes the programmable features of FPGA, realizes the hardware-accelerated of key operation.FPGA one end obtains the data of AD sampling and accelerates computing, and the other end is communicated by letter with TMS320F28335, and the result of calculation after processing is sent to processor.Processor is controlled FPGA by data line ([FDATA15:FDATA0]), address wire ([FADD4:FADD0]), chip select line (FNCS), read-write line (FNRD, FNWR).
Fig. 8 is the TMS320F28335 circuit.TMS320F28335 is the control core place of whole equipment, can control the analog signal processing gain, to the AD sample circuit reset and startup stop control, FPGA is read and write control, and can obtain the numerical value of temperature sensor, carry out working temperature and judge and result of calculation is calibrated.
Fig. 9 is temperature sensor circuit figure, and model is TMP121, is connected with TMS320F28335 by the spi bus interface, realizes the collection to working temperature.
The multichannel leakage current phase difference detection of the utility model equipment, simple in structure, computing velocity is fast, can accurately realize dielectric loss is carried out real time on-line monitoring.Adopt temperature compensation, can carry out establishment and compensation to the temperature drift of phase differential, affected by working environment little, be suitable for actual electric power environmental.Be conducive to the safety and stability of electric system, be with a wide range of applications.
Claims (6)
1. hyperchannel Leakage Current phase difference detection equipment, comprise analog signal processing, AD Acquisition Circuit and dsp processor, the multichannel leakage current signal of reference signal and collection is converted to voltage signal through precision resistance and is input to analog signal processing, analog signal processing carries out noise reduction to signal, filtering is sent to the AD Acquisition Circuit after processing, it is characterized in that: the sampled signal to the output of AD Acquisition Circuit utilizes digital filtering technique to carry out FFT, IFFT, filtering is processed, AD Acquisition Circuit output sampled signal sends to digital filter FPGA, data after digital filter FPGA will process are sent to dsp processor, carry out phase difference calculating and output by dsp processor.
2. hyperchannel Leakage Current phase difference detection equipment according to claim 1, it is characterized in that: analog signal processing is adjusted and simple filtering for signal is gained, adopt three grades of modulate circuits, reference path first order modulate circuit adopts integrated operational amplifier to realize the amplification of fixed gain, the first order path of leakage current adopts the integrated operational amplifier of adjustable gain pattern, adjust the one stage signal Voltage-output in suitable amplitude by multi-path analog switch MAX308ESE, the analog switch path of MAX308ESE is selected control end CS_A10, CS_A11, the controlled connection dsp processor of CS_A12, first order modulate circuit output signal is cascaded to second level modulate circuit, second level modulate circuit is designed to the Sallen-Key low-pass filter, third level modulate circuit sampling totalizer is adjusted to 2.5V with the signal DC level, so that signal satisfies the sample range of AD, and conditioning and the AD of signal are gathered isolation, change the impact on signal to prevent input impedance.
3. hyperchannel Leakage Current phase difference detection equipment according to claim 1 and 2, it is characterized in that: the AD sample circuit adopts AD conversion chip AD8365, dsp processor controlling of sampling chip TMS320F28335, data after digital filter FPGA processes are sent to TMS320F28335, control chip TMS320F28335 regulates the gain coefficient of front end modulate circuit, and utilize on the sheet timer output, export to AD8365 as sampling clock, start sampling and stop sampling; The startup of FPGA computing, processing stops to control function and is finished by TMS320F28335.
4. hyperchannel Leakage Current phase difference detection equipment according to claim 3, it is characterized in that: contain the phase difference compensation circuit, adopt temperature sensor to obtain working temperature, the temperature that utilization has been surveyed and the demarcation numerical value of phase differential, phase difference calculating result under the different temperatures is revised, and it is the digital temperature sensor of TMP121 that temperature sensor adopts model, and TMP121 is connected with TMS320F28335 by the spi bus interface, realization is to the collection of working temperature, the poor compensation of the line phase of going forward side by side.
5. hyperchannel Leakage Current phase difference detection equipment according to claim 1, it is characterized in that: contain the phase difference compensation circuit, adopt temperature sensor to obtain working temperature, the temperature that utilization has been surveyed and the demarcation numerical value of phase differential, phase difference calculating result under the different temperatures is revised, and it is the digital temperature sensor of TMP121 that temperature sensor adopts model, and TMP121 is connected with dsp processor by the spi bus interface, realization is to the collection of working temperature, the poor compensation of the line phase of going forward side by side.
6. hyperchannel Leakage Current phase difference detection equipment according to claim 2, it is characterized in that: contain the phase difference compensation circuit, adopt temperature sensor to obtain working temperature, the temperature that utilization has been surveyed and the demarcation numerical value of phase differential, phase difference calculating result under the different temperatures is revised, and it is the digital temperature sensor of TMP121 that temperature sensor adopts model, and TMP121 is connected with dsp processor by the spi bus interface, realization is to the collection of working temperature, the poor compensation of the line phase of going forward side by side.
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| CN 201220559604 CN202886471U (en) | 2012-10-30 | 2012-10-30 | Multi-channel leakage current phase difference detection equipment |
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| CN 201220559604 CN202886471U (en) | 2012-10-30 | 2012-10-30 | Multi-channel leakage current phase difference detection equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569589A (en) * | 2014-12-24 | 2015-04-29 | 北京无线电测量研究所 | Device and method for automatically testing Ku waveband phase difference of multi-branch power amplifier |
| CN104678267A (en) * | 2015-02-11 | 2015-06-03 | 华南理工大学 | Method for indirectly measuring dielectric loss of insulation layer of cable |
| CN106353580A (en) * | 2016-09-21 | 2017-01-25 | 中车大连电力牵引研发中心有限公司 | Analog quantity acquisition device |
| CN105116223B (en) * | 2015-07-21 | 2018-10-19 | 国家电网公司 | A kind of insulator contamination grade monitoring method based on leakage current phase difference |
| CN109932942A (en) * | 2017-12-15 | 2019-06-25 | 成都熠辉科技有限公司 | A kind of detection Synthesis Data Collection System Based |
-
2012
- 2012-10-30 CN CN 201220559604 patent/CN202886471U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569589A (en) * | 2014-12-24 | 2015-04-29 | 北京无线电测量研究所 | Device and method for automatically testing Ku waveband phase difference of multi-branch power amplifier |
| CN104569589B (en) * | 2014-12-24 | 2017-03-15 | 北京无线电测量研究所 | A kind of Ku wave bands multiple branch circuit power amplifier phase contrast automatic test device and method |
| CN104678267A (en) * | 2015-02-11 | 2015-06-03 | 华南理工大学 | Method for indirectly measuring dielectric loss of insulation layer of cable |
| CN105116223B (en) * | 2015-07-21 | 2018-10-19 | 国家电网公司 | A kind of insulator contamination grade monitoring method based on leakage current phase difference |
| CN106353580A (en) * | 2016-09-21 | 2017-01-25 | 中车大连电力牵引研发中心有限公司 | Analog quantity acquisition device |
| CN109932942A (en) * | 2017-12-15 | 2019-06-25 | 成都熠辉科技有限公司 | A kind of detection Synthesis Data Collection System Based |
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Granted publication date: 20130417 Termination date: 20181030 |